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Java Duration Class | minusDays() Method with Example

Duration Class minusDays() method: Here, we are going to learn about the minusDays() method of Duration Class with its syntax and example.
Submitted by Preeti Jain, on May 16, 2020

Duration Class minusDays() method

• minusDays() method is available in java.time package.
• minusDays() method is used to subtract the given duration in days from this Duration.
• minusDays() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• minusDays() method may throw an exception at the time of performing subtraction.
  ArithmeticException: This exception may throw when the calculated result value exceeds the limit.

Syntax:

    public Duration minusDays(long day_val);

Parameter(s):

• long day_val – represents the days to be subtracted from this Duration.

Return value:

The return type of this method is Duration, it returns the Duration that holds the value subtracted the given days from this Duration.

Example:

// Java program to demonstrate the example 
// of minusDays(long day_val) method of Duration

import java.time.*;
public class MinusDaysOfDuration {
    public static void main(String args[]) {
        long days = 2;

        // Instantiates two Duration objects
        Duration du1 = Duration.ofDays(3);
        Duration du2 = Duration.parse("P2DT20M");

        // Display du1, du2 
        System.out.println("du1: " + du1);
        System.out.println("du2: " + du2);

        System.out.println();

        // substracts the given duration
        // in days from this Duration du1 and returns
        // the Duration i.e. here we are substracting
        // the given 2 days from this du1 that holds
        // the value of 3 days i.e.( 72 hrs - 48 hrs
        // = 24 hrs )
        Duration minus_val = du1.minusDays(days);

        // Display minus_val
        System.out.println("du1.minusDays(days): " + minus_val);

        // substracts the given duration
        // in days from this Duration du1 and returns
        // the Duration i.e. here we are substracting
        // the given 2 days from this du2 that holds
        // the value of 2 days: 20 minutes 
        // i.e.( 48 hrs - 48 hrs
        // = 0 hrs )
        minus_val = du2.minusDays(days);

        // Display minus_val
        System.out.println("du2.minusDays(days): " + minus_val);
    }
}

Output

du1: PT72H
du2: PT48H20M

du1.minusDays(days): PT24H
du2.minusDays(days): PT20M